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Vanadium tetrasulfide/vanadium carbide composite material as well as preparation method and application thereof

A composite material, vanadium tetrasulfide technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low conductivity, poor cycle and rate performance, large volume expansion, etc., to increase the contact specific surface area, improve The effect of electrical conductivity, excellent rate capability

Pending Publication Date: 2022-07-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, VS 4 Possesses low conductivity and large volume expansion during electrochemical process, resulting in poor cycle and rate performance

Method used

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  • Vanadium tetrasulfide/vanadium carbide composite material as well as preparation method and application thereof
  • Vanadium tetrasulfide/vanadium carbide composite material as well as preparation method and application thereof
  • Vanadium tetrasulfide/vanadium carbide composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

example 1

[0059] This example is a kind of preparation of vanadium tetrasulfide / vanadium carbide composite material, and its preparation method comprises the following steps:

[0060] (1) Take 2g vanadium aluminum carbide (V 2 AlC) was added to the polytetrafluoroethylene reaction kettle, and then 40 mL of hydrofluoric acid (HF) with a concentration of 40% was added thereto, the water bath was 35° C., and the reaction was carried out for 24 h. After the reaction, it was centrifuged at 3500 rpm / min, washed with deionized water until neutral, and then transferred to a gas washing bottle, and 20 mL of 5% concentration of tetrabutylammonium hydroxide was added to the gas washing bottle. Atmospheric ventilation intercalation for 24h. V after intercalation 2 CT x Wash to neutrality again by centrifugation at 3500 rpm / min. The washed product was again subjected to ultrasonic stripping with argon or nitrogen for 1 h, and the supernatant was separated by high-speed centrifugation at 5000 rpm...

example 2

[0065] This example is a kind of preparation of vanadium tetrasulfide / vanadium carbide composite material, and its preparation method comprises the following steps:

[0066] (1) Take 2g vanadium aluminum carbide (V 2 AlC) was added to the polytetrafluoroethylene reaction kettle, and then 80 mL of hydrofluoric acid (HF) with a concentration of 40% was added thereto, and the water bath was 40° C., and the reaction was carried out for 24 h. After the reaction, it was centrifuged at 3500 rpm / min, washed with deionized water until neutral, and then transferred to a gas washing bottle, and 20 mL of 5% concentration of tetrabutylammonium hydroxide was added to the gas washing bottle. Atmospheric ventilation intercalation for 24h. V after intercalation 2 CT x Wash again to neutrality by centrifugation at 5000 rpm / min. The washed product was again subjected to ultrasonic stripping with argon or nitrogen for 2 hours, and the supernatant was separated by high-speed centrifugation at ...

example 3

[0070] This example is a kind of preparation of vanadium tetrasulfide / vanadium carbide composite material, and its preparation method comprises the following steps:

[0071] (1) Take 2g vanadium aluminum carbide (V 2 AlC) was added to the polytetrafluoroethylene reaction kettle, and then 40 mL of hydrofluoric acid (HF) with a concentration of 40% was added thereto, the water bath was 40° C., and the reaction was carried out for 24 h. After the reaction, it was centrifuged at 3500 rpm / min, washed with deionized water until neutral, and then transferred to a gas washing bottle, and 20 mL of 7% concentration of tetrabutylammonium hydroxide was added to the gas washing bottle, under argon or nitrogen. Atmospheric ventilation intercalation for 24h. V after intercalation 2 CT x Wash again to neutrality by centrifugation at 5000 rpm / min. The washed product was again subjected to ultrasonic stripping with argon or nitrogen for 2 hours, and the supernatant was separated by high-spe...

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Abstract

The invention provides a vanadium tetrasulfide / vanadium carbide composite material as well as a preparation method and application thereof. The preparation method of the vanadium tetrasulfide / vanadium carbide composite material comprises the following steps: etching, intercalating and freeze-drying vanadium aluminum carbide to obtain few-layer V2CTx powder; the method comprises the following steps: mixing a vanadium source and an organic solvent to obtain a precursor solution, adding few-layer V2CTx powder into the precursor solution, and carrying out low-temperature ultrasonic treatment to obtain a first suspension; adding a sulfur source into the first turbid liquid, and stirring to obtain a second turbid liquid; and carrying out solvothermal reaction on the second suspension, washing, and freeze-drying to obtain the vanadium tetrasulfide / vanadium carbide composite material. The vanadium tetrasulfide / vanadium carbide composite material is applied to a battery negative electrode material. According to the synthesized vanadium sulfide / vanadium carbide composite material, the vanadium tetrasulfide nanosheet structure vertically grows on the surface of vanadium carbide, the contact specific surface area of an electrolyte and vanadium tetrasulfide is effectively increased, and the diffusion path of sodium ions in the material is shortened.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for sodium ion batteries, and in particular relates to a vanadium tetrasulfide / vanadium carbide composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are currently the most advantageous electrochemical energy storage devices, despite their high energy density, long cycle life, high operating voltage, and no memory effect. However, with the development of new energy technologies, the excessive use of lithium resources has led to increased costs, and the safety issues caused by lithium-ion batteries have become constraints for further development. As the same main group element of lithium, sodium has a higher standard potential, and the charging and discharging mechanism of sodium-ion batteries is similar to that of lithium-ion batteries. At the same time, the sodium reserves are abundant and the cost is low, and it can ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/36H01M4/58H01M4/587
CPCH01M4/362H01M4/5815H01M4/587H01M4/136Y02E60/10
Inventor 王明珊陈淋曾敏李恩智李星
Owner SOUTHWEST PETROLEUM UNIV
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